When properly laid, GRP roofing or glass fibre roofing as it is more commonly known will lastfor a minimum of 30 years with very little deterioration. There are however a few key tips youmust remember in order to get the most out of a GRP roof. Firstly the roof should be laid on adry deck and preferably in dry conditions with a temperature not below 5anddeg;C.
Secondly you must ensure that the resins and top coats should be suitably for use in roofing.
When applying the GRP laminate and top coat, the deck should be of 18 mm exterior plywoodor Sterling Board and be well fixed onto the underlying joists. Usually it takes two men about aday to strip, re-deck, laminate and top coat a roof of about 20 square metres.
Always try to plan starting the roof when a settled period of weather is forecast and ensure the new deck is laid to adequate falls to allow for good drainage. There should not be any standing water on the roof after completion.
When the new deck is fully prepared, the work is carried out in the following sequence;
1: Trimming: Fitting the edge trims.
2: Bandaging: Reinforcing the board joints.
3: Laminating: Applying the GRP roofing membrane.
4: Top Coating: Applying the final top coat.
As with any job of this type, you may encounter some problems when laying the roof or afterits completion. Following the specific instructions in our in depth GRP roofing article will ensure the best results however the following points indicate clear problem areas with GRP roofing
1) Delamination of the laminate from the boards: Moisture in the deck when laminating.
2) Flaking and Cracking of the top coat: Top coating onto a wet laminate or applying the top
coat too thickly.
3) Resin cures too fast: Conditions are too hot to lay resin or addition of too much catalyst.
4) Top coat cures too fast: See No.3.
5) Resin cures too slowly or not at all: No catalyst addition or temperature too low. The cure
will stop and temperature drops to freezing.
6) Patch or Streaky cure of resin or top coat: Insufficient catalyst and inadequate mixing.
7) Resin does not cure and appears milky white: Water contamination.
8) Excessive fibre pattern: Too little resin and insufficient consolidation.

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